Scroll to see break-even price per barrel for oil in 2015 for select oil producers, and click on a country's name for more details. modest oil-price recovery and currency devaluations have lowered breakeven prices for countries like Russia and Nigeria, but some petrostates still need oil prices above $100 a barrel to balance their budgets.
There are dozens of types of gemstones â including diamonds, colored gemstones, and pearls â each with a unique set of physical and optical properties. GIRDLE â The narrow band around the perimeter of a polished or faceted diamond or colored gemstone.
One gemstone carat is 200 mg. Carat, a measure of weight, should not be confused with karat, which refers to gold purity. The price per carat of different gemstones can vary enormously, from as little as one dollar to tens of thousands of dollars per carat. Many factors influence the price per carat of gems.